ST-W1/2 series 10/100M Singlemode Single Fiber Media Converter can convert Optical－Electric Ethernet signals between 10/100M UTP interface (TX) and 100M optical fiber interface (FX). It could extend traditional 10/100M Fast Ethernet to the distance of 90km through single optical fiber link. It possesses stable performance and good quality by adopting latest IC from USA and Taiwan. It must be used in couples，because the transmitted optical differs from the receive optical in wavelength. 6 Group LED indicated lights could fully monitor the working conditions of Converters. It is easy for users to observe network operation.